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2018 Map of Dunnigan

Name: 2018 Topographic Map of Dunnigan
Creator: U.S. Geological Survey
Published: 2018
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2018

About this map

Dunnigan serves as the central hub for this agricultural landscape, situated along the corridor between the Dunnigan Hills and the extensive water management network of the Sacramento Valley. This survey captures a highly engineered environment where natural watercourses like Buckeye Cr and Dunnigan Cr are integrated into a system of man-made infrastructure, including the Colusa Basin Drainage Canal and the Wilkins Slough Main Irrigation Canal. The grid of rural roads, such as Yolo Co Line RD and White RD, follows the Township and Range lines of the Public Land Survey System, defining the boundaries of large-scale farming operations.

Local history and genealogy interests are anchored by features like Johns Cem and the settlement at Hershey. The transition from the elevated terrain of Howells Point Ridge to the low-lying Main Drain reflects the hydraulic complexity required to support the region's productive land. The map also identifies the boundary between Colusa Co and Yolo Co, providing clear spatial context for historical property research in this section of Northern California.